Timer



A. W. KAUFMAN.

TIMER.

APPLICATION FILED JULY 26,1921.

1,425,86. Pate ted Aug. 15, 1922.

{gm/QM Adam W. Kaufman %12 flwawm/ I 5 also run upon the end of the holder shank for coi'inecting the conductor wire. .oend inn from the collar 7 of the hold-er is a threaded coupling,- nipple 8, which nipple is adapted to receive the outer end of a closely coiled section of spring); 9, the same wreath t utin a lu'usli The end of the coil spring has fitted hereiu, a metallic head it), the same constituting); a solid coi'itact shoe, that is preferably cir cular in c section. The coils of the sifiring are approximately of the same pitch the thread upon the coupling nipple, and hence, the brush tip can be readily screwed to position and hold firmly by the coupling nipple, it being understood that the free end of each coil spring carrying the shoe 10, is extended in the path of travel of the wiper cam 2, whereby make-and-brealr contact between the relatively rotative parts is effected.

In practice, it has been found that although many advantages result from the use of brush of the coil spring type, it has developed that, while the coil spring is normally straight, it has a tendency to yield in opposition to force in all directions. Hence, when such type of brushes are engaged by the cam, the pliability will result in the tendency of the brush to sag backwardly under certain renditions, and thus occasionally create a slight variation in the timing of the spark.

My present invention overcomes this tendency entirely, due to the fact that the problem has been solved by employing a guide for the brush, whereby said brush is oositively held, so as to move in one plane only, or at a right angle to the line of travel. of the cam.

The guide, in this exemplilication of my invention, is formed from a single blank, including a web 6, which is arranged parallel to the holder 6. The upper end of the web, is :folded over to form a foot 7, having a slot therein, which slot is adopted to straddle and engage the shank portion (5 of the holder, being inserted between the juxtaposed insulated washer 5 and the collar 7. The lower end of the web has extended therefrom, and folded forwardly, a pair of guide wings 9, between which guide wings the coil spring brush 9 extends and is thus held against lateral play, while freeingmovement of the brush. in a longitudinal direction is had. It is understood that the brush guide, as a whole, is rotatorily adjusted about the axis of the holder shank, so as to position the wings in longitudinal alignment with the shaft or, in other words, such adjustment will permit the contact brush to move baclr and forth at a right angle to the travel of the cam. Hence the brush thus l eing held against lateral movement will always effect a contact at the same high point of the cam in its cycle.

it will also he observed, that when a (in cam or his; is used, in place of a side swipinn cam, the guide can readily be rotated from the before mentioned location, so as to permit movement of the brush in a plane parallel to the rotation of the shaft.

Owing: to this adjustability, it is also observed that after the brush has been used for a pr termined time and the coil spruurs have been flexed upon a constant plane to a point where deterioration might l'BtBUli, the coil spring brush can be rotated to chanrgc the line of flexure. This adjustment oi": the parts will also present a new contact face of the brush shoe 10 to the cam, whereby proper timing is insured, which timing may be varied in instances where the shoe would flatten or wear.

While I have shown and described one simple exemplification of the brush guide, obviously I may vary the structural. feature of the guide within the scope of the plane as they will hereinafter be interpreted by those skilled in the art.

I claim:

1. A timer comprising a relatively rotated cam and contact brush, the same including a normally straight coil sectional spring, capable of yieldingin all directions, and a guide for directing movement of the coil spring brush in a single plane.

2. A timer comprising a relatively rotated cam and contact brush, the same including a normally straight coil sectional spring, capa bio of yielding in all directions, and a guide for directing movement of the coil spring brush in a single plane only.

3. A timer comprising a housing, a rotatory cam mounted in the housing, holders extending inwardly from the housing, coil spring brushes carried by the holders cugag'eable with the cam, and guides extending inwardly from the housing associated with the holders, the guides'havinn' side wings for encasing; the brushes, whereby the same are held against movement except in one direction.

i. In a timer mechanism having a rotatory cam, a housing mounted thereabout, holders extending; through the housing, coil springs secured to the holders, the same constituting contact brushes for engagement with the cam, and means associated with the holders and housing for limited movement of the coil spring brushes except in one direction.

5. A timer comprising a rotatory cam, a housing associated with the cam, collared holders extending through the housing, coiled spring brush sections secured to the holders and extending into the line of travel of the cam, guides for the coil spring brush sections, the guides being formed with apertured feet for engagement with the holders, whereby they are frictionally held in position, the said guides having Wings eneasing one piece guide for the contact brushes, the

same including a Web having a slotted foot extension whereby the guide is attached,

the Web being provided atits opposite end with parallel guide wings and a renewable cam for brushes comprising a hub inoludlng a separable cam plate having a foot extend- 15 ing therefrom, and means for securing the cam plate to the hub.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in

the county of Milwaukee and State of Wis 20 oonsin. V

ADAM W. KAUFMAN. 

